Thin PdCu membrane for hydrogen purification from in-situ produced methane reforming complex mixtures containing H2S
van Delft, Y.C.
A 0.9 mm PdCu (69 wt% Pd) membrane prepared by an electroless plating method on a ceramic tubular support was tested in hydrogen sulfide containing streams. H2S/H2 mixtures with 40 and 100 ppmv of H2S were tested in order to observe the reversibility of sulfur addition. The membrane permselectivity operating in H2S/complex mixtures with around 32 ppmv of H2S in CH4, CO, CO2 and H2 was also tested. The streams were in-situ produced by Methane Steam Reforming and Methane Catalytic Partial Oxidation reactions. Prior to the tests with H2S, the hydrogen flux of the membrane at 773 K and 2 bar of pressure difference was 0.92 mol m -2 s -1 Membrane hydrogen flux decreased by around 50–80% in the tests with H2S/H2 mixture, but it recovered to the original values after removing H2S. In H2S/complex mixtures operation, the flux decrease was smaller due to concentration polarization phenomena. Although no sulfide compounds where detected on the membrane by SEMEDX, XRD or XPS, the H2S or the employed temperatures seem to induce Cu segregation to the membrane surface
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Energy / Geological Survey Netherlands
Chemical Engineering Science, 176, 1-10